Improvement in revolving paddles



J.W.McDERMOTT.

v Revolving Paddles. N0. 135 ,653.

Patented Feb. 11,1873

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UNITED STATES PATENT QFFIGE.

JOHN W. MoDEBMOTT, on NEW YORK, N. Y.

IMPROVEMENT IN REVOLVING PADDLES.

Specification forming part of Letters Patent No. 135,653, dated February11, 1873.

To all whom it may concern:

Be it known that I, JOHN W. MODER- MOTT, of the city, county, and Stateof New York, have made certain Improvements in Vvhecls for lropellingBoats, of which the following is a specification:

The object of this invention is to regulate the projection of the bucketfrom the axis of the wheel or shaft at different points of revolution,so that it shall have the greatest hold upon the water at that pointwhere it would effect the best results; and it consists .in theconstruction of the parts whereby the result is obtained, as will bemore fully hereinafter described.

In the drawing, Figure 1 is a section side view, and Fig. 2 is atransverse view of same.

A represents a portion of the hull of a vessel; B, the space in thestern or other portion of the hull of a vessel that is to receive thepropeller-wheel and other parts connected therewith. G is the rudder,and its D is the shaft, bearing on journals cl d. E is a sliding bucketor paddle, and freely slides longitudinally in a mortise or opening thatgoes transversely through the shaft D. c e are friction-rollers upon theouter ends of the buckets or paddles E. e e are friction-rollersattached to the shaft D, and bear upon each side of the sliding bucketE, and e e are friction-rollers attached to the shaft at the ends of themortise through the shaft and bear upon the edges of the sliding bucketE. There can be two or more of these sliding buckets, when desired. F Fare curved guides, made fast to the hull of the vessel above shaft D,and curved eccentric thereto, or of such form that when the bucket is ina horizontal position it will project equally at each side of shaft D,but when in a perpendicular position will project very much more belowthan above the shaft. These curved guides do not come together at theirlowest projection, but there is a space, f, left between them in orderto permit of the removal of themselves or the buckets at any time or forany cause. The

curvature of these guides can be changed so that they may be more orless eccentric to the axis of shaft D, as circumstances may require. Gis a cog-wheel upon the driving shaft 9 and gears into toothed wheel Gupon the axle d of the shaft D, and through these gear-wheels arevolving motion is given to said shaft D and buckets E by any motivepower-such as steam, compressed air, or other convenient or properpower.

By this construction and position of the driving or propellingwheel byhaving the buckets project more at the point where such greaterprojection would give much better return in the result without anyincrease of power, it will readily be seen that by the change ofprojection of the end of the bucket when it is used to propel the vesselforward by its being forced deeper into the water by the guide it has agreater hold upon the water, and must therefore produce a/ greatereffeet, while the opposite end of the same bucket presents little or noresistance, as the projection is merely nothing. Also, by thisconstruction the buckets do not lift the water; hence no great wave isproduced in the wake of the wheel, and if the vessel is used in thewater of a canal no sensible washing away of the earth banks of thecanal will take place, thus making it a desirable arrangement for use oncanals.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. The bucket or paddle E, freely sliding in a mortise that goestransversely through the shaft D, substantially as herein described.

2. The sliding buckets or paddles E having the end friction-rollers e eand freely sliding in transverse mortise in shaft D, in combination withthe guide-rods F, substantially as and for the purpose described.

3. The combination of the shaft D having a transverse mortise therein,sliding bucket E, and friction-rollers e e, substantially as hereindescribed.

JOHN W. MODERMOTT.

Witnesses JAMES GARVEY, OWEN MQGINNIS,

